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Double-side pressure-sensitive adhesive sheet and displaying appts. set with touch panel

A technology for pressure-sensitive adhesive sheets and display devices, applied in the direction of film/sheet-like adhesives, adhesives, films/sheets without carriers, etc. Mixture and other issues

Inactive Publication Date: 2007-03-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when a conventional linerless pressure-sensitive adhesive tape (a linerless pressure-sensitive adhesive tape composed of only one pressure-sensitive adhesive layer) is used as a pressure-sensitive adhesive tape for attaching a touch panel, although it can satisfy optical requirements Isotropic, but may be difficult to peel off in case of errors during application, or processability may be reduced due to adhesive residue, resulting in low "reusability"
By the way, in the case of adhesive residue, there may be cases where work such as wiping off residual adhesive is required
In addition, there may be cases of reduced durability
[0004] On the other hand, when a lined double-sided tape is used, the double-sided tape is of such a form that a different pressure-sensitive adhesive is applied to a backing such as biaxially stretched polyethylene terephthalate. on both surfaces, although it enhances reusability and durability, it does not meet the optical requirements
Furthermore, since a backing is provided, there arises a problem of making it thicker in proportion to its thickness

Method used

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  • Double-side pressure-sensitive adhesive sheet and displaying appts. set with touch panel
  • Double-side pressure-sensitive adhesive sheet and displaying appts. set with touch panel
  • Double-side pressure-sensitive adhesive sheet and displaying appts. set with touch panel

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0090] In a three-necked flask, 92 parts of butyl acrylate as a monomer component of an acrylic acid polymer, 8 parts of acrylic acid and 100 parts of ethyl acetate as a polymerization solvent were charged, and the mixture was stirred for 2 hours while feeding nitrogen thereinto. After thus excluding oxygen in the polymerization system, 0.2 part of 2,2'-azobisisobutyronitrile was added, the temperature was raised to 60°C, and the mixture was reacted for 10 hours. Ethyl acetate was added to the reaction mixture to obtain an acrylic polymer solution having a solid content of 30% (hereinafter referred to as "acrylic polymer A solution").

preparation example 2

[0092] Except using 98 points of butyl acrylate as the monomer component of the acrylic acid polymer and 2 points of acrylic acid, an acrylic polymer solution having a solid content of 30% (hereinafter referred to as "acrylic acid polymer B solution") was prepared in the same manner as in Preparation Example 1. ").

preparation example 3

[0094] An acrylic acid polymer solution having a solid content of 30% (hereinafter referred to as "acrylic acid") was prepared in the same manner as in Preparation Example 1, except that 98 points of 2-ethylhexyl acrylate was used as the monomer component of the acrylic acid polymer and 2 points of acrylic acid. Polymer C solution").

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Abstract

A double-sided pressure-sensitive adhesive sheet to be used in sticking and fixing a touch panel to a display surface of a display device is described, one surface of the double-sided pressure-sensitive adhesive sheet being stuck substantially entirely on the touch panel, and the other surface being stuck substantially entirely on the display surface of the display device, wherein the double-sided pressure-sensitive adhesive sheet has at least two adhesive layers but does not have a substrate, is constructed such that it is repeatedly peelable against at least one surface of the touch panel and the display surface of the display device, and has optical isotropy.

Description

field of invention [0001] The present invention relates to a double-sided pressure-sensitive adhesive sheet for pasting and fixing a touch panel to a display surface of the display device and a display device provided with a touch panel. Background of the invention [0002] In recent years, mobile communication terminals such as mobile phone terminals such as cellular phones, PHS and PDA terminals constitute a large market, and their future development is also expected. For mobile communication terminals, examples of main directions of technological goals include thin size, light weight, low power consumption, high definition, and high brightness. In particular, in a PDA on which a touch panel of a resistive film system is mounted as an input unit, a structure in which a touch panel of a resistive film system is mounted on an LCD module is generally employed. In the touch panel of this resistive film system, there is an air layer between the upper electrode and the lower el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B7/10C09J7/02G02B5/30C09J7/10C09J133/00G06F1/16G06F3/033G06F3/041
CPCC09J7/00G06F3/041Y10T428/2891C09J2201/36C09J2433/00B32B7/10B32B17/064C09J2201/128Y10T428/2848C09J7/10C09J2301/208C09J2301/124G06F3/0412B32B17/10G06F1/1643B32B7/12
Inventor 岸冈宏昭椿裕行
Owner NITTO DENKO CORP